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Dual ISP at HQ and Single ISP at Branch with Multiple GRE tunnels between

Background

HQ has dual ISPs (a.b.c.d is fa0/0 and e.f.g.h is dialer1). Branch has single ISP (i.j.k.l is fa0/0). Both sides are using Cisco 2621 routers.

There are two GRE tunnels created between the HQ and Branch offices. On the HQ side Tunnel0 (ip = x.x.x.1/30, source = fa0/0 of the hq router, and destination = fa0/0 of the branch router) - Tunnel1 (ip = x.x.x.5/30, source = dialer1 of the hq router, and destination = fa0/0 of the branch router). On the Branch side Tunnel0 (ip = x.x.x.2/30, source = fa0/0 of the branch router, and destination = fa0/0 of the hq router) - Tunnel1 (ip = x.x.x.6/30, source = fa0/0 of the branch router, and destination = dailer1 of the hq router).

Private LAN info. For the HQ side the private LAN is 10.10.10.0/24 and for the Branch side the private LAN is 192.168.10.0/24.

Here are the static routes.

HQ Side

0.0.0.0 0.0.0.0 dialer1 5

0.0.0.0 0.0.0.0 fa0/0 10

192.168.10.0 255.255.255.0 Tunnel0 5

192.168.10.0 255.255.255.0 Tunnel1 10

Branch Side

0.0.0.0 0.0.0.0 fa0/0

10.10.10.0 255.255.255.0 Tunnel0 5

10.10.10.0 255.255.255.0 Tunnel1 10

Desired End Result

What I would like to do is use dialer1 on the HQ side to be my primary Internet connection for that office and fa0/0 for the backup Internet connection for that office. Also, on the HQ side I would like to use Tunnel0 as my primary link to the branch office and Tunnel1 as my backup link to the branch office. On the Branch office side I would like to use Tunnel0 as my primary link to the hq office and Tunnel1 as my backup link to the hq office.

Current Situation

On the HQ side dialer1 is both the primary Internet connection for that office (this is what I want), but Tunnel1 is the primary link to the branch office (not what I want). On the Branch side Tunnel1 is the primary link to the hq office (not what I want)

Please let me know if you have questions or need additional information.

2 REPLIES
Hall of Fame Super Bronze

Re: Dual ISP at HQ and Single ISP at Branch with Multiple GRE tu

Did you verify Tunnel 0 is actually up?

can you provide full running config from both routers along with the output from the route table?

New Member

Re: Dual ISP at HQ and Single ISP at Branch with Multiple GRE tu

Edison,

The Tunnel 0 never does come up. It has something to do with the route statements, but I am not sure exactly how to pin point it.

The configs are attached.

Thank you,

Bruce

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